What is Claude Opus 4.8's current context window?

1 M token context window, dated May 28, 2026, from a primary source (platform.claude.com). The record asserts this claim as of November 11, 2026 (status valid, confidence 0.70).

model · fact

Claude Opus 4.8 context window

Claude Opus 4.8 in its family's lineage →

As of November 11, 2026, Claude Opus 4.8's context window on the AsOf record is 1 M token context window, dated May 28, 2026, from a primary source (platform.claude.com).

Claude Opus 4.8 on another date · compare two dates

current context window: 1 M token context windowMay 28, 2026 · 1 source

Every dated value

1 value · 1 current

Claude Opus 4.8 context window: every dated value on the record, oldest first, with its dates, status, confidence and sources
value	valid fromThe day the value took effect, not the day it was published. A period figure (a year's revenue) is dated at the period's end.More in About →	valid to	confidenceHow well the sources support the value, from 0 to 1. A single primary source is asserted from 0.7; nothing below 0.5 is asserted; a dead or disagreeing source lowers it.More in About →	sourcesPrimary: the entity's own filing, feed or site. Secondary: a publisher reporting it. Each claim links every source it has, with the passage that states the value where one was read.More in About →
1 M token context window: context window 1M token context window from 2026-05-28, claim clm_34EE9AAE8E66 and its sources to present · platform.claude.com	2026-05-28	present	0.70	platform.claude.com

Questions this record answers

What is Claude Opus 4.8's current context window?: 1 M token context window, dated May 28, 2026, from a primary source (platform.claude.com). The record asserts this claim as of November 11, 2026 (status valid, confidence 0.70).

Answered from the rows above, as of November 11, 2026.

Cite Claude Opus 4.8 context window

Each form names the value, its as-of date (2026-05-28), the day you read it (2026-11-11), the claim's stable URL and id and its primary source. The URL never changes: a superseded claim stays at the same address.

Plain text

AsOf. "Claude Opus 4.8 context window: 1M token context window", as of 2026-05-28. Claim clm_34EE9AAE8E66, https://asof.is/claim/clm_34EE9AAE8E66, accessed 2026-11-11. Source: https://platform.claude.com/docs/en/release-notes/overview#2026-05-28.

APA

AsOf. (2026). Claude Opus 4.8 context window: 1M token context window (as of 2026-05-28) [Record clm_34EE9AAE8E66]. Retrieved November 11, 2026, from https://asof.is/claim/clm_34EE9AAE8E66 (source: https://platform.claude.com/docs/en/release-notes/overview#2026-05-28)

BibTeX

@misc{asof_clm_34EE9AAE8E66,
  author = {AsOf},
  title = {Claude Opus 4.8 context window: 1M token context window},
  year = {2026},
  howpublished = {\url{https://asof.is/claim/clm_34EE9AAE8E66}},
  note = {Claim clm\_34EE9AAE8E66, as of 2026-05-28; source: https://platform.claude.com/docs/en/release-notes/overview\#2026-05-28},
  urldate = {2026-11-11}
}

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